CN106772188B - Mutual inductor operation characteristic evaluation method based on environmental influence factors and assessment platform - Google Patents
Mutual inductor operation characteristic evaluation method based on environmental influence factors and assessment platform Download PDFInfo
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Abstract
The invention discloses a mutual inductor operation characteristic evaluation method based on environmental influence factors, wherein the mutual inductor comprises an electromagnetic mutual inductor and an electronic mutual inductor, and the method comprises the following steps: the standard current transformer and the standard voltage transformer are connected into the assessment platform through the switch unit; the first data acquisition module sends acquired secondary voltage operation data of the voltage transformer to be detected to the data processing module; the second data acquisition module sends the acquired secondary current operation data of the current transformer to be detected to the data processing module; the third data acquisition module sends the acquired secondary current value of the standard current transformer and the acquired secondary voltage value of the standard voltage transformer to the data processing module; and the data processing module respectively calculates and obtains a ratio difference value and an angle difference value of the voltage transformer to be tested and the current transformer to be tested according to the data, and is used for analyzing the running error characteristics of the transformers under different environmental influence factors.
Description
Technical Field
The invention relates to the field of key technologies of intelligent equipment, in particular to a mutual inductor operation characteristic evaluation method and an assessment platform based on environmental influence factors.
Background
The traditional mode for evaluating the operating characteristics of the mutual inductor in the power industry is to adopt a mode of laboratory verification before commissioning and periodic verification in the operating process, and judge the metering performance of the mutual inductor according to whether data of the laboratory and the periodic verification are qualified or not. The periodic field inspection mode has great defects, on one hand, the field inspection is greatly influenced by external factors, the normal operation condition of the metering device cannot be evaluated, a great amount of manpower, financial resources and time are consumed for each round-trip field work, the cost is relatively high, and the safety risk of the field work is large; on the other hand, due to the lack of a real-time monitoring system, the fault problem of the mutual inductor cannot be timely found and processed. With the application of electronic transformers and other transformers with novel principles in a large number, the stability and reliability of the electronic transformers in the operation process are still in certain gaps compared with those of the traditional electromagnetic transformers, and the reliability of the metering performance in the operation process is more difficult to ensure through a laboratory verification method and a periodic verification method.
With the continuous development of sensor technology and data acquisition and transmission technology, aiming at the defects of the traditional evaluation mode, from the 90 s in the 20 th century, some online monitoring devices aiming at mutual inductors with different principles appear at home and abroad, and whether the error of the mutual inductor is qualified or not is judged by acquiring state parameters in the running process of the mutual inductor in real time and combining test data in the periodic verification process. The existing method for judging the operating characteristics of the mutual inductor is to acquire electrical parameters such as primary voltage, current and the like in the operating process of the mutual inductor through an online monitoring device, perform error calculation with a reference standard to obtain specific difference and angular difference data of the mutual inductor, and then judge whether the mutual inductor is out of tolerance.
The existing method for evaluating the operating characteristics of the mutual inductor is to install the checked mutual inductor in a certain actually-operated transmission line, and the method is not beneficial to checking the operating characteristics of the mutual inductor under different working conditions. For example, the primary voltage of a voltage transformer generally changes within the range of +/-5% of rated voltage; the primary current of the current transformer is 'real power' current generated by an electric load on a line, the general dynamic range is very small, and the primary current mostly changes within the range of 20% -50% of rated primary current; for mutual inductors with different voltage grades, different transmission lines need to be found for installation, which wastes time and labor; due to the requirement of power supply reliability, the power transmission line in actual operation cannot be overhauled at any time in a power failure mode, and therefore the fault mutual inductor cannot be replaced in time.
Disclosure of Invention
In order to solve the above problem, according to an aspect of the present invention, there is provided a transformer operating characteristic evaluation method based on environmental influence factors, the method including:
the standard current transformer and the standard voltage transformer are connected into the assessment platform through the switch unit;
the first data acquisition module sends acquired secondary voltage operation data of the voltage transformer to be detected to the data processing module;
the second data acquisition module sends the acquired secondary current operation data of the current transformer to be detected to the data processing module;
the third data acquisition module sends the acquired secondary current value of the standard current transformer and the acquired secondary voltage value of the standard voltage transformer to the data processing module, wherein the secondary current value of the standard current transformer comprises a real power current value generated by loading primary voltage of a system on a load and a virtual power current value generated by the current booster; and
and the data processing module respectively calculates and obtains a ratio difference value and an angle difference value of the voltage transformer to be detected and the current transformer to be detected according to the secondary voltage operation data, the secondary current value of the standard current transformer and the secondary voltage value of the standard voltage transformer, and is used for analyzing the transformer operation error characteristics under different environmental influence factors.
Preferably, the voltage transformer to be tested comprises an electromagnetic voltage transformer or an electronic voltage transformer.
Preferably, the current transformer to be tested comprises an electromagnetic current transformer or an electronic electromagnetic transformer.
Preferably, the switch unit can realize a real power current operating mode and a combined current operating mode of real power current plus virtual power current by controlling a combination of on and off of the high-voltage switch.
Preferably, the real-power current operating mode is realized by closing the first switch, the fifth switch, the sixth switch and the ninth switch, and opening the second switch, the third switch, the fourth switch and the seventh switch to connect the standard current transformer into the test line, wherein the current in the test line forms a current path through the electromagnetic current transformer, the electronic current transformer, the fifth switch, the standard current transformer, the sixth switch, the ninth switch and the load.
Preferably, the standard current transformer is not connected to a test line by closing the first switch, the seventh switch and the ninth switch and opening the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch, and a path is formed by current in the test line through the electromagnetic current transformer, the electronic current transformer, the seventh switch, the ninth switch and the load, so that the real-power current operating mode is realized.
Preferably, the standard current transformer is connected into a test line by closing the first switch, the second switch, the fourth switch, the fifth switch, the sixth switch and the ninth switch and opening the third switch and the seventh switch, and a current path is formed by the high-voltage switch 2, the electromagnetic current transformer, the electronic current transformer, the fifth switch, the standard current transformer, the sixth switch, the fourth switch and the current booster in the test line, so that a combined current working mode of real power current and virtual power current is realized.
Preferably, the standard current transformer is not connected to the experimental line by closing the first switch, the second switch, the third switch, the seventh switch and the ninth switch and opening the fourth switch, the fifth switch and the sixth switch, and the current in the experimental line passes through the second switch, the electromagnetic current transformer, the electronic current transformer, the third switch and the current booster to form a current path, so that a combined current working mode of real power current and virtual power current is realized.
Preferably, the ratio difference value and the angle difference value are respectively drawn by using the environment data measured by the environment monitoring sensor, and the ratio difference characteristic curve and the angle difference characteristic curve are used for analyzing the operation error characteristics of the transformer under different environment influence factors.
Preferably, wherein the environmental monitoring sensor comprises: the temperature sensor, the humidity sensor, the air pressure sensor and the salt fog sensor are respectively used for measuring the temperature, the humidity, the air pressure and the salt fog value in the operating environment.
Preferably, the specific difference characteristic curve comprises: temperature-specific difference characteristic curve, humidity-specific difference characteristic curve, air pressure-specific difference characteristic curve and salt fog-specific difference characteristic curve.
Preferably, the angular difference characteristic comprises: temperature-angular difference characteristic curve, humidity-angular difference characteristic curve, air pressure-angular difference characteristic curve and salt fog-angular difference characteristic curve.
Preferably, wherein the different environmental impact factors include: high severe cold, high dry heat, high damp heat, high altitude and high salt spray.
Preferably, the operating characteristics of the voltage transformer to be tested and the current transformer to be tested are analyzed in terms of both temperature and humidity in a severe cold environment, a high dry and hot environment and a high humid and hot environment; analyzing the operating characteristics of the voltage transformer to be tested and the current transformer to be tested in terms of air pressure in a high-altitude environment; and analyzing the operation characteristics of the voltage transformer to be tested and the current transformer to be tested in the aspect of salt fog under the high-salt fog environment.
According to another aspect of the invention, an assessment platform for evaluating the operating characteristics of a transformer based on environmental influence factors is provided, and comprises: the device comprises a voltage regulator, a test transformer, a first data acquisition module, a second data acquisition module, a third data acquisition module, a data processing module, a voltage transformer to be tested, a current booster and a standard current transformer. A standard voltage transformer and a switch unit,
the switch unit connects the standard current transformer and the standard voltage transformer into the assessment platform;
the primary voltage of the experimental circuit in the examination platform is generated by a test transformer, the connection end of the test transformer and the voltage regulator is a low-voltage input end, and the connection end of the test transformer and the first switch is a high-voltage output end;
the primary end (high-voltage end) of the voltage transformer to be tested is connected with a test circuit, the secondary end (low-voltage end) of the voltage transformer to be tested is connected with the first data acquisition module, and the first data acquisition module is connected with the data processing module;
the primary ends of the current transformers to be tested are respectively connected in series in a test circuit, the secondary ends of the current transformers to be tested are respectively connected with the second data acquisition module, and the second data acquisition module is connected with the data processing module; and
and the primary ends of the standard current transformer and the standard voltage transformer are respectively connected with a test line, and the secondary ends of the standard current transformer and the standard voltage transformer are respectively connected with a third data acquisition module.
Preferably, the assessment platform further comprises:
and the environment monitoring sensor is connected with an environment monitoring module of the mutual inductor online monitoring device.
Preferably, the assessment platform can realize a real power current working mode and a combined current mode of real power current and virtual power current.
Preferably, wherein the switching unit includes: the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch and the ninth switch.
The invention has the beneficial effects that:
1. the patent provides an implementation scheme of a mutual inductor live-line examination platform, which is used for the running characteristic research of electromagnetic mutual inductors and electronic mutual inductors. The examination platform generates primary voltage and primary current required by the test through the test transformer and the current booster, wherein after the virtual power current generated by the current booster is combined with the real power current generated by the load in the line, the dynamic range of the current in the test line can be improved.
2. The primary voltage and the primary current of the examination platform are regulated by controlling the input voltage of the voltage regulator and the input voltage of the current booster.
3. By controlling the on/off combinational logic of the high-voltage switch in the assessment platform, two working modes of the primary current in the assessment platform only comprising 'real power' current and 'real power' current plus 'virtual power' current are realized. The implementation scheme not only truly simulates the working condition of the mutual inductor in an actual operation line, but also realizes the flexible adjustment of test voltage and current, and can more perfectly obtain the operation characteristics of the examined mutual inductor under different working conditions.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow diagram of an evaluation method 100 according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an evaluation method and an assessment platform according to an embodiment of the invention; and
fig. 3 is a schematic structural diagram of a data acquisition module according to another embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
In the existing method, external environment influence factors are not considered, and the adopted online monitoring device does not contain environment monitoring sensors such as temperature and humidity, so that the operation data does not contain environment monitoring data, and whether the operation state of the transformer is normal or not is judged only through the fact that whether the transformer is out of tolerance or not. The method can only answer the good and bad of the transformer operation state, but cannot answer the transformer error change caused by what reason. Especially, for metering equipment such as an electronic transformer which is greatly influenced by an external environment, because environmental monitoring data such as temperature and humidity are not available, detailed error characteristic analysis research is difficult to develop through operation data in a later period, and data support cannot be provided for optimization design of the electronic transformer.
Fig. 1 is a flow chart of an evaluation method 100 according to an embodiment of the present invention. As shown in fig. 1, the transformer operating characteristic evaluation method 100 based on environmental influence factors starts from step 101, and a standard current transformer and a standard voltage transformer are connected to an assessment platform via a switch unit in step 101. FIG. 2 is a schematic diagram of an evaluation method and an assessment platform according to an embodiment of the invention. As shown in fig. 2, the assessment platform comprises: the device comprises a voltage regulator, a test transformer, an environment monitoring sensor, a first data acquisition module, a second data acquisition module, a third data acquisition module, a mutual inductor online monitoring device, an electromagnetic voltage mutual inductor, an electronic voltage mutual inductor, an electromagnetic current mutual inductor, an electronic current mutual inductor, a current booster, a standard current mutual inductor and a standard voltage mutual inductor. Preferably, the primary voltage of the experimental circuit in the examination platform is generated by a test transformer, the connection end of the test transformer and the voltage regulator is a low-voltage input end, and the connection end of the test transformer and the high-voltage switch 1 is a high-voltage output end. The high-voltage output end generates primary voltage in the test circuit of the test platform, and the proportional relation between the low-voltage input end and the high-voltage output end of the test transformer is a fixed value.
The primary voltage value in the test line is controlled by a voltage regulator connected with the test transformer. The voltage regulator changes the voltage value of the output end (the low-voltage input end of the test transformer) of the voltage regulator, and realizes the regulation of the primary voltage generated by the high-voltage output end of the test transformer. When the voltage of the output end of the voltage regulator is increased, the primary voltage generated by the high-voltage output end of the test transformer is increased; when the voltage of the output end of the voltage regulator is reduced, the primary voltage generated by the high-voltage output end of the test transformer is reduced.
Preferably, in step 102, the first data acquisition module sends the acquired secondary voltage operation data of the voltage transformer to be tested to the data processing module. The voltage transformer to be tested comprises an electromagnetic voltage transformer or an electronic voltage transformer. Preferably, the primary ends (high voltage ends) of the electromagnetic voltage transformer and the electronic voltage transformer are respectively connected with a test line, the secondary ends (low voltage ends) of the electromagnetic voltage transformer and the electronic voltage transformer are respectively connected with the first data acquisition module, and the first data acquisition module is connected with the data processing module of the transformer on-line monitoring device. The first data acquisition module sends the acquired operation data of the secondary voltages of the electromagnetic voltage transformer and the electronic voltage transformer to the data processing module for data processing and analysis.
Preferably, in step 103, the second data acquisition module sends the acquired secondary current operation data of the current transformer to be tested to the data processing module. Preferably, the current transformer to be tested comprises an electromagnetic current transformer or an electronic current transformer. Preferably, the primary ends of the electromagnetic current transformer and the electronic current transformer are respectively connected in series in a test line, the secondary ends of the electromagnetic current transformer and the electronic current transformer are respectively connected with the second data acquisition module, and the second data acquisition module is connected with the data processing module of the mutual inductor online monitoring device. And the second data acquisition module sends the acquired operation data of the secondary current of the electromagnetic current transformer and the electronic current transformer to the data processing module for data processing and analysis.
The primary current value in the test line is generated in two ways, one is real power current and the other is virtual power current. The real power current is generated by loading a primary voltage in the examination platform on a load, and the magnitude of the real power current is equal to the ratio of the primary voltage value to the load impedance. The virtual power current is generated by the current booster, the magnitude of the virtual power current is adjusted by the input end of the current booster, and when the power of the input end is increased, the virtual power current generated in the test circuit by the output end of the current booster is increased; when the input power is reduced, the 'virtual power' current generated in the test line by the output end of the current booster is reduced. Preferably, the switching unit can realize a real power current operating mode and a combined current operating mode of real power current plus virtual power current by controlling a combination of on and off of the high-voltage switch.
The assessment platform can realize a real-power current working mode and a combined current mode of real-power current and virtual-power current. Preferably, the switch unit can realize a real power current operating mode and a combined current operating mode of real power current plus virtual power current by controlling a combination of on and off of the high-voltage switch. When the working mode only comprises real power current, the working mode is the same as the running mode of the current transformer in an actual power transmission circuit, and the actual running working condition can be truly simulated; when the working mode is a combined current working mode of real power current and virtual power current, the dynamic range of the current in the test circuit can be flexibly adjusted by adjusting the magnitude of the virtual power current, the problem that the check point of the real power current is single is solved, and the virtual power current is more energy-saving and environment-friendly compared with the real power current.
The switching of the two working modes is realized by the on/off combination logic of a high-voltage switch in a control circuit. As shown in fig. 2, in the "real power" current operating mode, the switching can be achieved by closing the high-voltage switch 1, the high-voltage switch 5, the high-voltage switch 6, and the high-voltage switch 9, and opening the high-voltage switch 2, the high-voltage switch 3, the high-voltage switch 4, and the high-voltage switch 7, at this time, the standard current transformer is connected into a test line, and a current path is formed by the current in the test line through the electromagnetic current transformer, the electronic current transformer, the high-voltage switch 5, the standard current transformer, the high-voltage switch 6, the high-voltage; the method can also be realized by closing the high-voltage switch 1, the high-voltage switch 7 and the high-voltage switch 9 and opening the high-voltage switch 2, the high-voltage switch 3, the high-voltage switch 4, the high-voltage switch 5 and the high-voltage switch, at the moment, the standard current transformer is not connected with a test line, and the current in the test line forms a path through the electromagnetic current transformer, the electronic current transformer, the high-voltage switch 7, the high-voltage switch 9 and a load. When the combined current working mode of the real power current and the virtual power current is adopted, the combined current working mode can be realized by closing the high-voltage switch 1, the high-voltage switch 2, the high-voltage switch 4, the high-voltage switch 5, the high-voltage switch 6, the high-voltage switch 9 and disconnecting the high-voltage switch 3 and the high-voltage switch 7, at the moment, a standard current transformer is connected into a test circuit, and the current in a loop formed by the high-voltage switch 2, the electromagnetic current transformer, the electronic current transformer, the high-voltage switch 5, the standard current transformer, the high-voltage switch 6, the high-voltage switch 4 and the current booster in the test; the method can also be realized by closing the high-voltage switch 1, the high-voltage switch 2, the high-voltage switch 3, the high-voltage switch 7 and the high-voltage switch 9 and opening the high-voltage switch 4, the high-voltage switch 5 and the high-voltage switch 6, at the moment, the standard current transformer is not connected with a test line, and the current in a loop formed by the high-voltage switch 2, the electromagnetic current transformer, the electronic current transformer high-voltage switch 3 and the current booster is combined current. Wherein the high voltage switch 8 is either closed or open, irrespective of the cooperative mode of operation.
Preferably, the third data acquisition module sends the acquired secondary current value of the standard current transformer and the acquired secondary voltage value of the standard voltage transformer to the data processing module in step 104, wherein the secondary current value of the standard current transformer comprises a real power current value generated by the load loaded by the primary voltage of the system and a virtual power current value generated by the current booster. And the primary ends of the standard current transformer and the standard voltage transformer are respectively connected with a test line, and the secondary ends of the standard current transformer and the standard voltage transformer are respectively connected with a third data acquisition module. And the standard current transformer and the standard voltage transformer are respectively used as reference standards of the current transformer and the voltage transformer to be tested in the assessment platform. The standard mutual inductor can not work in a charged mode for a long time, so that the standard mutual inductor works in a mode that the standard mutual inductor is connected into a test line every three hours from a zero point every day, is connected into the test line for 15 minutes every time, and is cut out after the time comes. The standard current transformer realizes the control of switching in and switching out by controlling the high-voltage switch 5, the high-voltage switch 6 and the high-voltage switch 7, switches in a circuit when the high-voltage switch 5 and the high-voltage switch 6 are closed and the high-voltage switch 7 is opened, and switches out on the contrary; the standard voltage transformer realizes the control of switching in and switching out through the high-voltage switch 8, and the high-voltage switch 8 is switched in a circuit when being closed, otherwise, the high-voltage switch is switched out.
Preferably, in step 105, the data processing module calculates a ratio difference value and an angle difference value between the voltage transformer to be measured and the current transformer to be measured according to the secondary voltage operation data, the secondary current value of the standard current transformer and the secondary voltage value of the standard voltage transformer, respectively, and analyzes the transformer operation error characteristics under different environmental influence factors. Preferably, the ratio difference value and the angle difference value are respectively drawn by using the environment data measured by the environment monitoring sensor, and the ratio difference characteristic curve and the angle difference characteristic curve are used for analyzing the operation error characteristics of the mutual inductor under different environment influence factors. The environment monitoring sensor is connected with an environment monitoring module of the mutual inductor online monitoring device. Preferably, wherein the environmental monitoring sensor comprises: the temperature sensor, the humidity sensor, the air pressure sensor and the salt fog sensor are respectively used for measuring the temperature, the humidity, the air pressure and the salt fog value in the operating environment.
Preferably, the specific difference characteristic curve comprises: temperature-specific difference characteristic curve, humidity-specific difference characteristic curve, air pressure-specific difference characteristic curve and salt fog-specific difference characteristic curve. Preferably, the angular difference characteristic comprises: temperature-angular difference characteristic curve, humidity-angular difference characteristic curve, air pressure-angular difference characteristic curve and salt fog-angular difference characteristic curve. Preferably, wherein the different environmental impact factors include: high severe cold, high dry heat, high damp heat, high altitude and high salt spray. Preferably, the operating characteristics of the voltage transformer to be tested and the current transformer to be tested are analyzed in terms of both temperature and humidity in a severe cold environment, a high dry and hot environment and a high humid and hot environment; analyzing the operating characteristics of the voltage transformer to be tested and the current transformer to be tested in terms of air pressure in a high-altitude environment; and analyzing the operation characteristics of the voltage transformer to be tested and the current transformer to be tested in the aspect of salt fog under the high-salt fog environment.
Fig. 3 is a schematic structural diagram of a data acquisition module according to another embodiment of the present invention. As shown in fig. 3, the test line of the examination platform takes phase B as an example, and the examination platform includes one voltage regulator, one test transformer, 2 electromagnetic voltage transformers (test articles), 3 electronic voltage transformers (test articles), 2 electromagnetic current transformers (test articles), 3 electromagnetic voltage transformers (test articles), 1 current booster, 1 standard CT, 1 standard PT, and 1 load. The main parameters of the sample voltage transformer are 10kV/0.2 grade, the main parameters of the sample current transformer are 10kV/0.2S grade/600A, the standard CT is 10kV/0.05 grade/600A, and the standard PT is 10kV/0.05 grade.
The primary voltage of the experimental circuit in the examination platform is generated by a test transformer, the connection end of the test transformer and the voltage regulator is a low-voltage input end, and the connection end of the test transformer and the high-voltage switch 1 is a high-voltage output end. The high-voltage output end generates primary voltage in the test circuit of the test platform, and the proportional relation between the low-voltage input end and the high-voltage output end of the test transformer is a fixed value.
The primary voltage value in the test line is controlled by a voltage regulator connected with the test transformer. The voltage regulator changes the voltage value of the output end (the low-voltage input end of the test transformer) of the voltage regulator, and realizes the regulation of the primary voltage generated by the high-voltage output end of the test transformer. When the voltage of the output end of the voltage regulator is increased, the primary voltage generated by the high-voltage output end of the test transformer is increased; when the voltage of the output end of the voltage regulator is reduced, the primary voltage generated by the high-voltage output end of the test transformer is reduced.
When the electromagnetic voltage transformer and the electronic voltage transformer are objects to be checked, a primary end (a high-voltage end) is respectively connected with a test line, a secondary end (a low-voltage end) is respectively connected with the first data acquisition module, and the first data acquisition module is connected with a data processing module of the transformer on-line monitoring device. The first data acquisition module sends the acquired operation data of the secondary voltages of the electromagnetic voltage transformer and the electronic voltage transformer to the data processing module for data processing and analysis.
When the electromagnetic current transformer and the electronic current transformer are examination objects, a primary end of each of the electromagnetic current transformer and the electronic current transformer is connected in series in a test line, a secondary end of each of the electromagnetic current transformer and the electronic current transformer is connected with the second data acquisition module, and the second data acquisition module is connected with a data processing module of the mutual inductor online monitoring device. And the second data acquisition module sends the acquired operation data of the secondary current of the electromagnetic current transformer and the electronic current transformer to the data processing module for data processing and analysis.
The primary current value in the test line is generated in two ways, one is real power current and the other is virtual power current. The real power current is generated by loading a primary voltage in the examination platform on a load, and the magnitude of the real power current is equal to the ratio of the primary voltage value to the load impedance. The virtual power current is generated by the current booster, the magnitude of the virtual power current is adjusted by the input end of the current booster, and when the power of the input end is increased, the virtual power current generated in the test circuit by the output end of the current booster is increased; when the input power is reduced, the 'virtual power' current generated in the test line by the output end of the current booster is reduced.
The assessment platform can realize a real power current working mode and a combined current mode of real power current and virtual power current. Preferably, the switch unit can realize a real power current operating mode and a combined current operating mode of real power current plus virtual power current by controlling a combination of on and off of the high-voltage switch. When the working mode only comprises real power current, the working mode is the same as the running mode of the current transformer in an actual power transmission circuit, and the actual running working condition can be truly simulated; when the working mode is a combined current working mode of real power current and virtual power current, the dynamic range of the current in the test circuit can be flexibly adjusted by adjusting the magnitude of the virtual power current, the problem that the check point of the real power current is single is solved, and the virtual power current is more energy-saving and environment-friendly compared with the real power current.
The switching of the two working modes is realized by the on/off combination logic of a high-voltage switch in a control circuit. As shown in fig. 3, when the examination platform is in the "real power" current working mode, the examination platform can be implemented by closing the high-voltage switch 1, the high-voltage switch 5, the high-voltage switch 6 and the high-voltage switch 9 and opening the high-voltage switch 2, the high-voltage switch 3, the high-voltage switch 4 and the high-voltage switch 7, at this time, the standard current transformer is connected into a test line, and current in the test line forms a current path through the electromagnetic current transformer, the electronic current transformer, the high-voltage switch 5, the standard current transformer, the high-voltage switch 6, the high-voltage switch 9 and a; the method can also be realized by closing the high-voltage switch 1, the high-voltage switch 7 and the high-voltage switch 9 and opening the high-voltage switch 2, the high-voltage switch 3, the high-voltage switch 4, the high-voltage switch 5 and the high-voltage switch, at the moment, the standard current transformer is not connected with a test line, and the current in the test line forms a path through the electromagnetic current transformer, the electronic current transformer, the high-voltage switch 7, the high-voltage switch 9 and a load. When the examination platform is in a combined current working mode of 'real power' current plus 'virtual power' current, the examination platform can be realized by closing the high-voltage switch 1, the high-voltage switch 2, the high-voltage switch 4, the high-voltage switch 5, the high-voltage switch 6, the high-voltage switch 9 and disconnecting the high-voltage switch 3 and the high-voltage switch 7, at the moment, a standard current transformer is connected into a test circuit, and the current in a loop formed by the high-voltage switch 2, the electromagnetic current transformer, the electronic current transformer, the high-voltage switch 5, the standard current transformer, the high-voltage switch 6, the high-voltage switch 4 and the current booster in the test; the method can also be realized by closing the high-voltage switch 1, the high-voltage switch 2, the high-voltage switch 3, the high-voltage switch 7 and the high-voltage switch 9 and opening the high-voltage switch 4, the high-voltage switch 5 and the high-voltage switch 6, at the moment, the standard current transformer is not connected with a test line, and the current in a loop formed by the high-voltage switch 2, the electromagnetic current transformer, the electronic current transformer high-voltage switch 3 and the current booster is combined current. Wherein the high voltage switch 8 is either closed or open, irrespective of the cooperative mode of operation.
And the third data acquisition module sends the acquired secondary current value of the standard current transformer and the acquired secondary voltage value of the standard voltage transformer to a data processing module of the transformer on-line monitoring device in the assessment platform, wherein the secondary current value of the standard current transformer comprises a real power current value generated by loading the primary voltage of the system on a load and a virtual power current value generated by the current booster. And the primary ends of the standard current transformer and the standard voltage transformer are respectively connected with a test line, and the secondary ends of the standard current transformer and the standard voltage transformer are respectively connected with a third data acquisition module. And the standard current transformer and the standard voltage transformer are respectively used as reference standards of the current transformer and the voltage transformer to be tested in the assessment platform. The standard mutual inductor can not work in a charged mode for a long time, so that the standard mutual inductor works in a mode that the standard mutual inductor is connected into a test line every three hours from a zero point every day, is connected into the test line for 15 minutes every time, and is cut out after the time comes. The standard current transformer realizes the control of switching in and switching out by controlling the high-voltage switch 5, the high-voltage switch 6 and the high-voltage switch 7, switches in a circuit when the high-voltage switch 5 and the high-voltage switch 6 are closed and the high-voltage switch 7 is opened, and switches out on the contrary; the standard voltage transformer realizes the control of switching in and switching out through the high-voltage switch 8, and the high-voltage switch 8 is switched in a circuit when being closed, otherwise, the high-voltage switch is switched out.
And the data processing module processes and analyzes the secondary voltage operation data, the secondary current value of the standard current transformer and the secondary voltage value of the standard voltage transformer and respectively calculates to obtain a ratio difference value and an angle difference value of the voltage transformer to be detected and the current transformer to be detected.
The assessment platform respectively draws a ratio difference characteristic curve and an angle difference characteristic curve by using the ratio difference value and the angle difference value and environment data obtained by measuring of the environment monitoring sensor, and is used for analyzing the running error characteristics of the mutual inductor under different environment influence factors. The environment monitoring sensor is connected with an environment monitoring module of the mutual inductor online monitoring device. Preferably, wherein the environmental monitoring sensor comprises: the temperature sensor, the humidity sensor, the air pressure sensor and the salt fog sensor are respectively used for measuring the temperature, the humidity, the air pressure and the salt fog value in the operating environment.
Preferably, the specific difference characteristic curve comprises: temperature-specific difference characteristic curve, humidity-specific difference characteristic curve, air pressure-specific difference characteristic curve and salt fog-specific difference characteristic curve. Preferably, the angular difference characteristic comprises: temperature-angular difference characteristic curve, humidity-angular difference characteristic curve, air pressure-angular difference characteristic curve and salt fog-angular difference characteristic curve. Preferably, wherein the different environmental impact factors include: high severe cold, high dry heat, high damp heat, high altitude and high salt spray. Preferably, the operating characteristics of the voltage transformer to be tested and the current transformer to be tested are analyzed in terms of both temperature and humidity in a severe cold environment, a high dry and hot environment and a high humid and hot environment; analyzing the operating characteristics of the voltage transformer to be tested and the current transformer to be tested in terms of air pressure in a high-altitude environment; and analyzing the operation characteristics of the voltage transformer to be tested and the current transformer to be tested in the aspect of salt fog under the high-salt fog environment.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (16)
1. A mutual inductor operation characteristic evaluation method based on environmental influence factors comprises an electromagnetic mutual inductor and an electronic mutual inductor, and comprises the following steps:
step 1, a standard current transformer and a standard voltage transformer are connected into an assessment platform through a high-voltage switch unit;
step 2, the first data acquisition module sends the acquired secondary voltage operation data of the voltage transformer to be detected to the data processing module;
step 3, the second data acquisition module sends the acquired secondary current operation data of the current transformer to be detected to the data processing module;
step 4, the third data acquisition module sends the acquired secondary current value of the standard current transformer and the acquired secondary voltage value of the standard voltage transformer to the data processing module, wherein the current value of the standard current transformer comprises a real power current value generated by loading the primary voltage of the system on a load and a virtual power current value generated by the current booster; and
step 5, the data processing module respectively calculates and obtains a ratio difference value and an angle difference value of the voltage transformer to be detected and the current transformer to be detected according to the secondary voltage operation data, the secondary current value of the standard current transformer and the secondary voltage value of the standard voltage transformer, and the ratio difference value and the angle difference value are used for analyzing the transformer operation error characteristics under different environmental influence factors;
wherein, the assessment platform comprises: the device comprises a voltage regulator, a test transformer, a first data acquisition module, a second data acquisition module, a third data acquisition module, a data processing module, a voltage transformer to be tested, a current booster, a standard current transformer, a standard voltage transformer and a high-voltage switch unit; the primary voltage of the experimental circuit in the examination platform is generated by a test transformer, the connection end of the test transformer and the voltage regulator is a low-voltage input end, and the connection end of the test transformer and the first high-voltage switch is a high-voltage output end; the primary end of the voltage transformer to be tested is connected with a test circuit, the secondary end of the voltage transformer to be tested is connected with the first data acquisition module, and the first data acquisition module is connected with the data processing module; the primary end of the current transformer to be tested is connected in series in a test circuit, the secondary end of the current transformer to be tested is connected with the second data acquisition module, and the second data acquisition module is connected with the data processing module; primary ends of the standard current transformer and the standard voltage transformer are respectively connected with a test line, and secondary ends of the standard current transformer and the standard voltage transformer are respectively connected with a third data acquisition module;
the high-voltage switch unit can realize a real power current working mode and a combined current working mode of real power current and virtual power current by controlling the on and off combination mode of the high-voltage switch;
one end of the first high-voltage switch is connected with the test transformer, and the other end of the first high-voltage switch is respectively connected with one end of the second high-voltage switch, the input end of the voltage transformer to be tested and the input end of the current transformer to be tested; one end of the second high-voltage switch is also connected with the input end of the voltage transformer to be tested and the input end of the current transformer to be tested respectively, and the other end of the second high-voltage switch is connected with the input end of the current booster; one end of a third high-voltage switch is respectively connected with the output end of the current booster and one end of a fourth high-voltage switch, and the other end of the third high-voltage switch is respectively connected with the output end of the current transformer to be tested, one end of a fifth high-voltage switch and one end of a seventh high-voltage switch; one end of the fourth high-voltage switch is also connected with the output end of the current booster, and the other end of the fourth high-voltage switch is connected with the other end of the seventh high-voltage switch; one end of the fifth high-voltage switch is also connected with the output end of the current transformer to be tested and one end of the seventh high-voltage switch, and the other end of the fifth high-voltage switch is connected with the input end of the standard current transformer; one end of the sixth high-voltage switch is connected with the output end of the standard current transformer, and the other end of the sixth high-voltage switch is respectively connected with one end of the eighth high-voltage switch and one end of the ninth high-voltage switch; the other end of the eighth high-voltage switch is connected with the input end of the standard voltage transformer; the other end of the ninth high-voltage switch is grounded through a load; and the output ends of the voltage transformer to be tested and the standard voltage transformer are both grounded.
2. The method of claim 1, wherein the voltage transformer under test comprises an electromagnetic voltage transformer or an electronic voltage transformer.
3. The method of claim 1, wherein the current transformer under test comprises an electromagnetic current transformer or an electronic electromagnetic transformer.
4. The method of claim 1, wherein the real power current operating mode is realized by closing the first high voltage switch, the fifth high voltage switch, the sixth high voltage switch and the ninth high voltage switch, and opening the second high voltage switch, the third high voltage switch, the fourth high voltage switch and the seventh high voltage switch to connect the standard current transformer into the test line, wherein the current in the test line forms a current path through the electromagnetic current transformer, the electronic current transformer, the fifth high voltage switch, the standard current transformer, the sixth high voltage switch, the ninth high voltage switch and the load.
5. The method of claim 1, wherein the real-power current operating mode is realized by closing the first high-voltage switch, the seventh high-voltage switch and the ninth high-voltage switch, and opening the second high-voltage switch, the third high-voltage switch, the fourth high-voltage switch, the fifth high-voltage switch and the sixth high-voltage switch to connect the standard current transformer to a test line, wherein current in the test line passes through the electromagnetic current transformer, the electronic current transformer, the seventh high-voltage switch, the ninth high-voltage switch and the load to form a path.
6. The method of claim 1, wherein the third high-voltage switch and the seventh high-voltage switch are disconnected by closing the first high-voltage switch, the second high-voltage switch, the fourth high-voltage switch, the fifth high-voltage switch, the sixth high-voltage switch and the ninth high-voltage switch to connect the standard current transformer into a test line, and current in the test line forms a current path through the second high-voltage switch, the electromagnetic current transformer, the electronic current transformer, the fifth high-voltage switch, the standard current transformer, the sixth high-voltage switch, the fourth high-voltage switch and the current booster to realize a combined current working mode of real power current and virtual power current.
7. The method of claim 1, wherein the standard current transformer is not connected to the experimental line by closing the first high voltage switch, the second high voltage switch, the third high voltage switch, the seventh high voltage switch and the ninth high voltage switch and opening the fourth high voltage switch, the fifth high voltage switch and the sixth high voltage switch, and current in the experimental line forms a current path through the second high voltage switch, the electromagnetic current transformer, the electronic current transformer, the third high voltage switch and the current booster, so that a combined current operating mode of real power current and virtual power current is realized.
8. The method of claim 1, wherein the ratio difference value and the angle difference value are used for respectively drawing a ratio difference characteristic curve and an angle difference characteristic curve according to the environment data measured by the environment monitoring sensor, and the ratio difference characteristic curve and the angle difference characteristic curve are used for analyzing the operation error characteristics of the transformer under different environment influence factors.
9. The method of claim 8, wherein the environmental monitoring sensor comprises: the temperature sensor, the humidity sensor, the air pressure sensor and the salt fog sensor are respectively used for measuring the temperature, the humidity, the air pressure and the salt fog value in the operating environment.
10. The method of claim 8, wherein the specific difference characteristic comprises: temperature-specific difference characteristic curve, humidity-specific difference characteristic curve, air pressure-specific difference characteristic curve and salt fog-specific difference characteristic curve.
11. The method of claim 10, wherein the angular difference characteristic comprises: temperature-angular difference characteristic curve, humidity-angular difference characteristic curve, air pressure-angular difference characteristic curve and salt fog-angular difference characteristic curve.
12. The method of claim 8, wherein the different environmental impact factors comprise: high severe cold, high dry heat, high damp heat, high altitude and high salt spray.
13. The method of claim 12, wherein the operating characteristics of the voltage transformer under test and the current transformer under test are analyzed in terms of both temperature and humidity in a severe cold environment, a hot and dry environment, and a hot and humid environment; analyzing the operating characteristics of the voltage transformer to be tested and the current transformer to be tested in terms of air pressure in a high-altitude environment; and analyzing the operation characteristics of the voltage transformer to be tested and the current transformer to be tested in the aspect of salt fog under the high-salt fog environment.
14. An environment influence factor-based mutual inductor operating characteristic evaluation and assessment platform comprises: a voltage regulator, a test transformer, a first data acquisition module, a second data acquisition module, a third data acquisition module, a data processing module, a voltage transformer to be tested, a current booster, a standard current transformer, a standard voltage transformer and a high-voltage switch unit,
the high-voltage switch unit connects the standard current transformer and the standard voltage transformer into the assessment platform;
the primary voltage of the experimental circuit in the examination platform is generated by a test transformer, the connection end of the test transformer and the voltage regulator is a low-voltage input end, and the connection end of the test transformer and the first high-voltage switch is a high-voltage output end;
the primary end of the voltage transformer to be tested is connected with a test circuit, the secondary end of the voltage transformer to be tested is connected with the first data acquisition module, and the first data acquisition module is connected with the data processing module;
the primary end of the current transformer to be tested is connected in series in a test circuit, the secondary end of the current transformer to be tested is connected with the second data acquisition module, and the second data acquisition module is connected with the data processing module; and
the primary ends of the standard current transformer and the standard voltage transformer are respectively connected with a test line, and the secondary ends of the standard current transformer and the standard voltage transformer are respectively connected with a third data acquisition module;
the high-voltage switch unit can realize a real power current working mode and a combined current working mode of real power current and virtual power current by controlling the on and off combination mode of the high-voltage switch;
one end of the first high-voltage switch is connected with the test transformer, and the other end of the first high-voltage switch is respectively connected with one end of the second high-voltage switch, the input end of the voltage transformer to be tested and the input end of the current transformer to be tested; one end of the second high-voltage switch is also connected with the input end of the voltage transformer to be tested and the input end of the current transformer to be tested respectively, and the other end of the second high-voltage switch is connected with the input end of the current booster; one end of a third high-voltage switch is respectively connected with the output end of the current booster and one end of a fourth high-voltage switch, and the other end of the third high-voltage switch is respectively connected with the output end of the current transformer to be tested, one end of a fifth high-voltage switch and one end of a seventh high-voltage switch; one end of the fourth high-voltage switch is also connected with the output end of the current booster, and the other end of the fourth high-voltage switch is connected with the other end of the seventh high-voltage switch; one end of the fifth high-voltage switch is also connected with the output end of the current transformer to be tested and one end of the seventh high-voltage switch, and the other end of the fifth high-voltage switch is connected with the input end of the standard current transformer; one end of the sixth high-voltage switch is connected with the output end of the standard current transformer, and the other end of the sixth high-voltage switch is respectively connected with one end of the eighth high-voltage switch and one end of the ninth high-voltage switch; the other end of the eighth high-voltage switch is connected with the input end of the standard voltage transformer; the other end of the ninth high-voltage switch is grounded through a load; and the output ends of the voltage transformer to be tested and the standard voltage transformer are both grounded.
15. The assessment platform of claim 14, further comprising:
and the environment monitoring sensor is connected with an environment monitoring module of the mutual inductor online monitoring device.
16. The assessment platform of claim 14, wherein the assessment platform is capable of varying the primary voltage and primary current required for a test through a test transformer and a current booster.
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| CN109470952A (en) * | 2018-11-05 | 2019-03-15 | 国网黑龙江省电力有限公司电力科学研究院 | A kind of 10KV electronic mutual inductor electrification evaluating platform |
| CN109581269A (en) * | 2018-12-25 | 2019-04-05 | 中国电力科学研究院有限公司 | A kind of electronic mutual inductor error characteristics fast appraisement method and system |
| CN109521389A (en) * | 2018-12-28 | 2019-03-26 | 武汉磐电科技股份有限公司 | A kind of electronic mutual inductor evaluating platform control system and its implementation |
| CN113296043B (en) * | 2020-02-21 | 2023-08-22 | 太原市优特奥科电子科技有限公司 | Online analysis method, device and equipment for voltage transformer errors and storage medium |
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